Double loop in ansible

Question

我正在尝试使用双循环，以便为检测到的磁盘创建一个LVM，然后将创建的LVM挂载到特定路径。

到目前为止，我可以使用with_items来创建LVM，但我无法找到一种方法来自动创建具有特定"应用程序"的LVM;变量>= 3个磁盘

PS:application用于lv/vg的名称和路径

示例:for sda, sdb, sdc

• sda:将被跳过，因为它已经从模板
分区
• sdb:我将使用postgres ==>vg-postgres,lv-postgres,/opt/postgres

• sdc:我将使用data ===>vg-data,lv-data,/ul>这是怎么做到的?

  main.yml

  ---
  - name: get a list of block devices (excludes loop and child devices)
  command: lsblk -n -o NAME --nodeps --exclude 7
  register: lsblk_out
  
  - include_tasks: lvm.yml
  with_items: '{{ lsblk_out.stdout_lines }}'
  when: sdx != 'sda'
  loop_control:
  loop_var: sdx
  

  lvm.yml

  ---
  - name: task for creating volume group with disk {{ sdx }}
  lvg:
  vg: vg-{{application}}
  pvs: /dev/{{ sdx }}
  pesize: 16
  state: present
  
  - name: task for creating logical volume
  lvol:
  vg: vg-{{application}}
  lv:  lv-{{application}}
  size: 100%FREE
  force: yes
  state: present
  - name: Create a ext4 filesystem on lvm "/dev/{{ sdx }}".
  filesystem:
  fstype: ext4
  dev: "/dev/vg-{{application}}/lv-{{application}}"
  force: no
  - name: Create a directory to mount the filesystem.
  file:
  path: "/opt/{{application}}"
  state: directory
  mode: '0755'
  - name: Mount the created  filesystem.
  mount:
  path: "/opt/{{application}}"
  src: "/dev/vg-{{application}}/lv-{{application}}"
  fstype: ext4
  opts: defaults
  state: mounted
  

Answer 1

有很多解决方案，您可以使用字典:

- include_tasks: lvm.yml
with_items: '{{ lsblk_out.stdout_lines }}'
when: sdx != 'sda'
loop_control:
loop_var: sdx
vars:
listsdx:
sdb: item1
sdc: item2
application: "{{  listsdx[sdx] }}"

如果你想使用这样的列表SDB = item1, SDC = item2，我取每个SDX的最后一个字符，并考虑'a' =0， 'b' = 1，等等

我需要为python函数ord创建自定义过滤器，该函数将字符转换为codeascii:

自定义过滤器:创建一个与剧本相同级别的folder filter_plugins，创建一个文件customfilter.py，我将过滤器命名为ord

文件customfilters.py

#!/usr/bin/python
class FilterModule(object):
def filters(self):
return {
'ord': self.ord
}
def ord(self, c):
return ord(c) - ord('a')

剧本:

- include_tasks: lvm.yml
with_items: '{{ lsblk_out.stdout_lines }}'
when: sdx != 'sda'
loop_control:
loop_var: sdx
vars:
apps: ["", 'item1', 'item2']
application: "{{  apps[sdx | last | ord] }}"